Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

Details Discovery of Localized Regions of Excess 10-TeV Cosmic Rays Discovery of Localized Regions of Excess 10-TeV Cosmic Rays

2008-01-24

arxiv.org/abs/0801.3827v3

Phys.Rev.Lett.101:221101,2008

Astronomy and Astrophysics

Astrophysics

Submitted to PhysRevLett

Scientific paper

10.1103/PhysRevLett.101.221101

An analysis of 7 years of Milagro data performed on a 10-degree angular scale has found two localized regions of excess of unknown origin with greater than 12 sigma significance. Both regions are inconsistent with gamma-ray emission with high confidence. One of the regions has a different energy spectrum than the isotropic cosmic-ray flux at a level of 4.6 sigma, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ~10 TeV. Potential causes of these excesses are explored, but no compelling explanations are found.

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